I love mini shogi because of how interesting games can be despite its small size.
Long games probably happen when both sides are strong enough not to make any obvious blunders but not strong enough to come up with very aggressive attacks. I’ve tried playing a few games with the strong Stockfish AI on pychess and I just get completely obliterated really quickly. I wonder what super high level human play is like.
I think what would be really interesting though, is short games with non-trivial blunders: the mini shogi the equivalent of Scholar’s or Fool’s mates, where the losing side is just making normal and usually good developments.